Re: Where is MMU enabled?

Rick Brown wrote:
> Hi List,
> 
> I am curious to know where is the MMU turned on in a Linux PPC system
> - is it the u-boot or the linux kernel?


It is Linux. u-boot uses the flat memory system.

  Since enabling of MMU shall be
> the point from where the CPU will have to generate virtual addresses -
> I think it should be somewhere in the kernel. The reason is that all
> the addresses that we give on the u-boot command line are physical
> addresses and not virtual, right (Thus implying MMU is not turned
> on?)?

yes. MMU is not turned on in u-boot

compare the data sheet and head_32.S for powerpc arch to know how the 
MMU is initialized .

> 
> Or is it that kernel always gets the control with MMU on on PPC systems?
> 
> How about other architectures?
> 
> Thanks,
> 
> Rick
> 
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-- 
Regards,
Mohamed Thalib H
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